Expert Oracle Exadata - Parent Directory

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CHAPTER 5 EXADATA SMART FLASH CACHEEXDB 71497 0 1220608 255 15EXDB 71775 0 651780096 1263 20868Unfortunately, the object name is not included in the list of attributes. This means you must go backto the database to determine which object is which (by querying dba_objects for example). Note that theObjectNumber attribute in cellcli is equivalent to the data_object_id in the database views such asdba_objects.SYS@EXDB1> select owner, object_name, object_type2 from dba_objects where data_object_id = 66849;OWNER OBJECT_NAME OBJECT_TYPE------------------------------ -------------------- -------------------KSO SKEW TABLEAt the Database LayerThe database really doesn’t provide much visibility into how ESFC is used. There is only one statisticavailable in v$sysstat and related views regarding its use.SYS@EXDB1> @mystatsEnter value for name: cell flash%NAMEVALUE---------------------------------------------------------------- ----------cell flash cache read hits 2188As with all such statistics, “cell flash cache read hits” is cumulative. In v$sysstat the statistic reflectsthe system total since the instance was started. In v$mystat the statistic reflects the session total sincethe session was started. So the only real way to make use of the information is to look at the value beforeand after the execution of a SQL statement of interest:SYS@EXDB1> @mystatsEnter value for name: cell flash%NAMEVALUE---------------------------------------------------------- ---------------cell flash cache read hits 769SYS@EXDB1> set echo onSYS@EXDB1> @avgskewSYS@EXDB1> select avg(pk_col) from kso.skew a where col1 > 02 /AVG(PK_COL)-----------16093750.8SYS@EXDB1> set echo offSYS@EXDB1> @mystatsEnter value for name: cell flash%139
CHAPTER 5 EXADATA SMART FLASH CACHENAMEVALUE---------------------------------------------------------- ---------------cell flash cache read hits 2550PerformanceSo how much benefit does the <strong>Exadata</strong> Smart Flash Cache actually provide? Probably one of the mosteffective measures of the effectiveness of the cache is the single block read times. Here’s a snippet froman AWR report for a fairly representative mixed workload production environment.Event Waits column c6 heading 'Flash Cache Hits' for 999,999,999,999SYS@EXDB1> col hit_ratio heading 'Hit Ratio' for 999.999140
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For your convenience Apress has pla
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IntroductionThank you for purchasin
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INTRODUCTIONwere implementing Exada
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CHAPTER 1 WHAT IS EXADATA?end of t
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CHAPTER 1 WHAT IS EXADATA? Kevin S
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CHAPTER 1 WHAT IS EXADATA?Limited
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CHAPTER 1 WHAT IS EXADATA?Software
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C H A P T E R 2Offloading / Smart S
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CHAPTER 2 OFFLOADING / SMART SCANR
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CHAPTER 2 OFFLOADING / SMART SCAN3
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CHAPTER 2 OFFLOADING / SMART SCANS
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C H A P T E R 3Hybrid Columnar Comp
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CHAPTER 3 HYBRID COLUMNAR COMPRESS
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C H A P T E R 8Configuring ExadataO
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CHAPTER 8 CONFIGURING EXADATAThe P
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CHAPTER 8 CONFIGURING EXADATAregis
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CHAPTER 8 CONFIGURING EXADATATable
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CHAPTER 9 RECOVERING EXADATAprovid
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CHAPTER 9 RECOVERING EXADATA-rw-r-
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CHAPTER 10 EXADATA WAIT EVENTSSYS@
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CHAPTER 10 EXADATA WAIT EVENTScell
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C H A P T E R 11Understanding Exada
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CHAPTER 11 UNDERSTANDING EXADATA P
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CHAPTER 12 MONITORING EXADATA PERF
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CHAPTER 13 MIGRATING TO EXADATA Ke
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C H A P T E R 14Storage LayoutIn Or
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CHAPTER 14 STORAGE LAYOUTFailure G
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CHAPTER 14 STORAGE LAYOUTGrid Disk
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CHAPTER 14 STORAGE LAYOUTASM Disk
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CHAPTER 14 STORAGE LAYOUT1 st Grid
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CHAPTER 14 STORAGE LAYOUTTable 14-
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CHAPTER 14 STORAGE LAYOUTparameter
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CHAPTER 15 COMPUTE NODE LAYOUTCPU
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C H A P T E R 16Unlearning Some Thi
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CHAPTER 16 UNLEARNING SOME THINGS
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A P P E N D I X ACellCLI and dcliCe
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APPENDIX A CELLCLI AND DCLILIST FL
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APPENDIX A CELLCLI AND DCLICellCLI
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A P P E N D I X BOnline Exadata Res
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A P P E N D I X CDiagnostic Scripts
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APPENDIX C DIAGNOSTIC SCRIPTSScrip
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Index• AAccess control list (ACL)
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• INDEXnetwork componentsclient a
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• INDEX• Epredicate offload, 36
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• INDEXOTHER_GROUPS consumer grou
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• INDEXCPU utilization, 152mixed
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• INDEXstructure, 105sub-query, 1
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Expert Oracle Exadatan n nKerry Osb
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Contents• About the Authors......
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• CONTENTSHow to Verify That Smar
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• CONTENTSControlling ESFC Usage
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• CONTENTSSummary ...............
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• CONTENTS• Chapter 12: Monitor
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• CONTENTS• Chapter 16: Unlearn
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About the Technical Reviewer Kevin
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